L'Institut de recherche interdisciplinaire de Grenoble (Irig) est un institut thématique de la Direction de la Recherche Fondamentale du CEA.
Notre Institut est composé de 5 départements
Les 10 Unités Mixtes de Recherches de l'Irig
Publications, Thèses soutenues, Prix et distinctions
Soutenance de thèse
Mercredi 26 octobre 2022 à 14:00, Salle 2A006, GreEn-ER, 21 avenue des Martyrs CS 90624 – 38031 Grenoble Cedex 1
Human race needs sustainable energy to develop. The ever-increasing carbon emissions from the use of fossil fuels and human conflicts call for the exploitation of alternative and renewable energy sources such as solar. Among emerging photovoltaics, dye-sensitized solar cells (DSSCs), amidst other thin-film technologies, have captured interests from academia and industry thanks to their low production costs, decent stability in applications, high efficiency and their tuneable optoelectronic properties. A DSSC layout comprises a photosensitizer immobilized on a semi-conductor, a redox couple (usually I3-/I-) and a Pt-coated cathode. Among these components, the photosensitizer allows for the fabrication of chromatic and semi-transparent solar cells, which are appealing candidates in the Building Integrated PhotoVoltaics (BIPV) industry. Nevertheless, for application as windows in BIPV, transparency and efficiency have to be optimized. Among the different approaches reported in this field, the use of NIR-photosensitizers allowed to reach an impressive transparency in the visible up to 76% but lead to sacrificing efficiencies. Another approach consists in developing semi-transparent solar cells with visible light-absorbing dyes but the optical transmission in that case is fixed during manufacturing and a compromise has to be found between efficiency and transparency. The STEP team has made efforts to reconcile these properties by replacing classical photosensitizers with organic photochromes. We have developed a new class of DSSCs with dynamic optical properties, capable to self-adapt their transparency levels and energy production as a function of daylight termed photo-chromo-voltaic devices. To attain high performance solar cells to pave their way for application, optimization of working conditions and hence the dyes is necessary. In this PhD, I will report on the development of photochromic solar cells registering efficiencies exceeding 4.2%, unravel the structure-property relationships and the photochromism-photovoltaic interplay for this new class of molecules. With this understanding, I have presented DSSCs with efficiencies ~5% marking the state-of-the-art in this subject area and suggested future research directions. Contact :
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Acteur majeur de la recherche, du développement et de l'innovation, le CEA intervient dans quatre grands domaines : énergies bas carbone, défense et sécurité, technologies pour l’information et technologies pour la santé.